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Rotating electrical machine cooling system

  • US 8,912,691 B2
  • Filed: 02/22/2013
  • Issued: 12/16/2014
  • Est. Priority Date: 02/22/2012
  • Status: Active Grant
First Claim
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1. A rotating electrical machine cooling system comprising:

  • a motive power unit that includes an internal combustion engine and a rotating electrical machine;

    a coolant reservoir in which a coolant for cooling the rotating electrical machine is stored;

    a mechanical coolant pump that is driven by the internal combustion engine, sucks the coolant from the coolant reservoir, and discharges the coolant to a main discharge flow channel via a first check valve to supply the coolant to the rotating electrical machine;

    an electric coolant pump that sucks the coolant from the coolant reservoir, is connected to the main discharge flow channel via a second check valve in parallel with the mechanical coolant pump, and discharges the coolant from a discharge port of the electric coolant pump to supply the coolant to the rotating electrical machine;

    a bypass flow channel that branches off from a flow channel between the discharge port of the electric coolant pump and the second check valve, to supply the coolant to the rotating electrical machine; and

    a relief valve that is provided in the bypass flow channel and opens at a predetermined relief pressure.

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